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Analysis of plastic bottle cap threads

1. Rotary deep screw
1. During the injection molding process, there is a rotating equipment system in the mold. This action can effectively maintain the integrity of the screw thread of the bottle cap. As a result, the thread profile of the cap can be effectively manipulated, and the cap wall will not be skewed when the thread on the shank is rotated.
2. During the capping operation of the bottle cap, the bottle cap can be converted into a straight force when rotating the upper bottle shank thread to tighten the bottle pad against the bottle shank.
3. Because the thread of the rotating tooth cannot effectively restrain the cap gasket legend from falling off, the screw cap should be glued when adding the gasket.
4. The rotating deep thread has the following defects:
A. It is not ideal to add multiple pads to this type of thread.
B. The screw cap restricts the design of the cap (for example, the cap with blocked thread cannot be rotated in the mold). Of course, screw cap molds are more complicated to plan and more expensive to manufacture.
C. There is no restriction on the selection of raw materials when making deep screw caps.
2. Strong removal of shallow threads
1. During the injection molding process, the cap can be easily demolded from the mold without the need for mold rotation. Obviously, when designing the screw thread of the bottle cap, the thread needs to be shallower to allow "strong release" during the injection molding process, and there must be a moderate thread enough that the thread can be well capped on the bottle shank thread.
2. The threaded cap can be posted without adding glue when the liner is added, and the liner can get the effective restraint of the thread, so that the legend of the bottle cap gasket is not easy to fall off.
3. When you want to add multiple layers of liners to the cap or make a variety of possible designs for the cap (such as caps with blocked threads), strong de-threading is the first choice.
4. The strong threaded cap has constraints on the raw materials during the injection molding process, and polyethylene and polypropylene materials are the popular choices.

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